Improve copy/paste menu appearance
Hans Boehm authored
Bug: 20503008

Correctly provide content position information to the ActionMode so
that menues can be better positioned.

Highlight a result that's about to be copied.

Ensure that the end of the current formula becomes visible when
the paste menu appears.

Change-Id: I318985776e59175b827d5089c0ca4978f3a658cb
7f83e36b